Hi
Clearly understood your all requirments regarding the proposal, quotation and user management web application with very simple and minimalist interface, we are very experienced web application developers with most of work as asked done for multiple clients in the past.
I am sure we can provide you the best results as required exactly, please chat to discuss it briefly and finalize so to initiate the working. Would also show the demo of relevant applications we have build.
This will be developed using PHP, MYSQL, HTML, JAVA, CSS.
Thanks
Patrick